Study Of Array Feed Parabolic Reflector Antenna For Spatial Power Combining

Electronic warfare plays a significant role in modern warfare. Making use of electromagnetic wave to radiate electron beam, it can not only destroy the electronic weapons and equipment of the adversary but also safeguard the normal performance of one's own weapons and equipment. To fulfill this task, it is imperative for electronic warfare to output very high radiant power to interfere with or cover the adversary's communication signals without influencing the normal functioning of one's own warfare system.The technique of spatial power combining superposes signals with different power sources together to form high-power microwave signal. It utilizes large-diameter beams or wave-guide modes to directly couple with active devices in order to realize the direct synthesis of power of multi single-unit components. Since all multi single-unit components work in parallel, the system loss only relies on the coupling performance of transmission modes and active devices and has nothing to do with the number of single-unit components, which can effectively solve the problem that the synthetic efficiency of circuit declines along with the increase of the number of single-unit components. It appears to be an effective way to produce high-power electromagnetic wave radiation.In order to solve the defects in design of traditional reflector antenna, the dissertation proposed a brand new array feed parabolic reflector antenna synthetized by spatial power according to Huygens-Fresnel principle. The feed arrays are deviated from focal points of the reflecting surfaces, the amplitudes and phases of the array elements are set as the same as that of the field distribution radiated from a point source at the focus. According to Huygens-Fresnel principle, the exposure field of feed array on the reflecting surfaces is the same as that of point-source feed. The result calculated through application of physical optics shows that the proposal mentioned in the dissertation can synthetize high-gain beams in a given direction without large-diameter paraboloid.With the help of method of images, the dissertation studied the phase and width of the antenna when it can effectively realize power combining, and studied the scan characteristics of the antenna as well. Under such circumstances, the author made use of both mechanical scanning and electric scanning to better improve the scan characteristics of the antenna. In particular, when the scanning angle is larger, the gain is 15dB higher than that produced by using mechanical scanning only or electric scanning.